Protective lining for metal containers



INVENTOR.

Jan. 27, 1942. w. HEsTERMANN PROTECTIVE LINING FOR' METAL CONTAINERS Filed June 27, 1,959

WAL TERHESTE/PMA/v/u @Hf @Zw/Mmmm.

Patented Jan. 27,1942

PROTECTIVE LINING FOR METAL CONTAINERS Walter Hestermann, Jersey City,

to White Hoboken, N.

N. 5'., assigner Metal Manufacturing Company, J., a corporation oi New Jersey Application June 27, i939, Serial No. wit-3 (Cl. 22d-60) 4 Claims.

My invention relates to a protective coating;

sequently these with the inner i a wide variety of conditions, 1t is very diiicult to protect the inner surfaces of the tubes by a lorotective lining. Such a lining or coating' in order to be effective, must not only be ilexible, but must adhere well to the surfaces much more reactive in the tropics; or, if a small amount of air were enclosed during filling, this might cause an attack on the llnmg and oi the the coating' so that it will lien lost but its contents `besides, ble expense and, possibly, loss ci My present invention provides o1' coating of greatly increased resistance to ti contents of tubes as, for example, shaving or shaving soap, and which resists attac corrosive materials or fillings ier an period of time, and thereby eieetively the walls of the tube from corrosion even adverse circumstances.

in my present invention. l. face oi the tube as, for example, ethyl cellulose made Toy tion of alkali cellulose and ethyl ohlori Je with a suitable plasticizer and solve. example oi a coating formed in aceoi' `ii my invention, l dissolve ethyl cellulose iii a su. able solvent. Solvents .tor ethyl cellulose are tain alcoo alcoholic etiieis, earbons, iti'oleuin hydrocarbon, or niiet n es er' them. iq example, a suitable mixture is containing the following:

coat tlso with a solution oi a Parts Toluene o M fl Ethanol liylol (or petroleum .'Eiutyl alcolici The ethyl cellulose is dissolved iii vent mixture in quantities to produ" product having approximately i to l in order to obtain an increased flexibility, a small amount oi a pla t is added. Bakelite or other natural, y resins or gums may be employed as olas However, I prefer to use an ester of a alcolici and a dibasic acid. filly-ooi l very desirable ester for this puree esters oi succinio, glutaric, at i other diloasic acids may be employ sebacate has sticky, which are retained in sufficient extent to en wall oi" the tube and sure good adlies with co.'

the tube without cracking amount of glycol sebacate (knows i; la as Paraplex) equal to 2% to 3% by the ethyl cellulose is suiiicient for this To form the coating, the tube covered with a thin lm accompanying drawing, in whicli-f- Fig. l is a vertical section oi a tube,

Fig. 2 is a cross section on a larger scale on e iine f2- i2 oi Fig. l.

in these figures, the wall of the tube is represented as i and the coating 2. A thin im of the above coating when dry, protects the inner suriace oi the tube from corrosion by acids or alkan lies, or acid reacting materials, and from deleterious contact with various salts and solvents that may be present in the contents of the container. The coating greatly increases the life of tubes, and particularly of tubes made of lead, lead alloy, tin, and lead coated with tin. In the case of tin coated lead tubes, the tin is not always distributed uniformly over the lead surface, and occasionally the lead is exposed at isolated points or in streaks or areas. Occasionally also, the tin surface layer is relatively thin and does not aiord a long lived protection against exposure of the lead. The lead must, however, be kept from Contact with the contents of the tube.

eeating formed of an alkyl cellulose, such as etny cellulose, protects the surface of the tube for a much longer period of time than other coatings or lacquers. A. soap solution in contact with air is highly destructive to such a lacquer as alkali-resistant pyroxylin. A tube coated with pyroxylin and inverted and iilled to within a short distance of its top edge with a iil% soap solution began to fail after 72 hours, and lfailed completely within 120 hours. This of course, equivalent to a matter o months for a soap paste not exposed to air. However, a tube coated with the coating of the present inventiony and of equal thickness, did not begin associa to fail until it had been exposed under the same conditions as the 10% soap solution, for a, period of to 200 hours. The thickness of the coating Was about .001 of an inch in each case.

It Willbe apparent, of course, that ethyl cellulose is given merely by way of example because it is the most convenient, and that other alkyl cellulose may be employed as, for example, butyl, propyl, etc., cellulose when they are available.

Through the above invention, therefore, I haveQ provided a lining or coating for metal containers, such as collapsible tubes, which is very resistant to attack by the contents of the tubes, and which efectively protects the walls of the tubes against corrosion.

What I claim is:

l. A collapsible tube having a flexible adherent inner coating comprising an alkyl cellulose containing not over about 3% of its weight of glycol sebacate.

2. A collapsible tube having a flexible adherent inner coating comprising an ethyl cellulose containing not over about 3% of its weight of glycol sebacate.

3. A collapsible tube having a flexible adherent inner coating comprising an alkyl cellulose containing not over about 3% of its weight of an ester of sebacic acid and a polyhydric alcohol.

4. A collapsible tube having a ilexible adherent inner coating comprising an ethyl cellulose containing not over about 3% of its weight of an ester of sebacic acid and a polyhydric alcohol.

WALTER HESTERMANN. 

